Question

Your classmate is starting a new fitness program. He is planning to ride his bicycle 50 minutes every day. He burns 55 calories per minute bicycling at 11 mph and 8.75 calories per minute bicycling at 15 mph. How long should he bicycle at each speed to burn 400 ​calories?

Answer 1

77 mph =385 calories 15 calories left =1 mph I think